Aristotle defines the soul as the animating form of a living body. If we are to use this definition then logically we think that the soul cannot exist separate from the body. However, Aristotle works around this. He admits that most of the soul's affections, such as anger, desire, and perception, depends on the body and are inconceivable except in relation to it. But he leaves open the fact that the soul's thinking may be independent of the body, which in this case the soul could be separate of the body. "It is quite clear then that the soul is not separable from the body, or that some parts of it are not, if it is its nature to have parts.